Kadau, Kai; Gruner, Markus; Entel, Peter; Kreth, Magnus:
Modeling Structural and Magnetic Phase Transitions in Iron-Nickel Nanoparticles
In: Phase Transitions, Vol. 76 (2003), No. 4 & 5, pp. 355 - 365
2003article/chapter in journal
Physics (incl. Astronomy)
thp
Related: 1 publication(s)
Title:
Modeling Structural and Magnetic Phase Transitions in Iron-Nickel Nanoparticles
Author:
Kadau, Kai;Gruner, MarkusUDE
GND
128899808
LSF ID
10281
ORCID
0000-0002-2306-1258ORCID iD
Other
connected with university
;
Entel, PeterUDE
LSF ID
1127
Other
connected with university
;
Kreth, Magnus
Year of publication:
2003

Abstract:

Martensitic phase transformations and magnetovolume effects in iron-nickel alloys are intimately related. The term Invar is widely used to characterize the unusual physical properties accompanying structural and magnetic instabilities such as those observed in the vicinity of the critical composition Fe65Ni35. We discuss the crossover from bulk iron-nickel alloys to nanoparticles with respect to structural and magnetic behavior. By employing molecular-dynamics and Monte Carlo methods, we find the absence of structural instabilities in defect-free particles, a linear scaling of the austenitic transformation temperature with the reciprocal cluster radius, as well as a decrease of the magnetic transition temperature with decreasing particle size.